> > I'm wondering if there isn't a reentrancy issue in QMap. > Almost. QMap works as it should if you only call const members, but as Konstantin said operator[] on a non-const instance is a mutating function.
I am pretty sure your problems will go away if you declare operator() as const. Then, the const version of operator[] will be called. This is an unfortunate side effect of Qt's implicit sharing of container classes. There is a tiny note here about a similar problem: http://doc.qt.io/qt-5/containers.html#implicit-sharing-iterator-problem
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